将一个只读依赖属性的数据绑定到Xaml中的ViewModel [英] Databind a read only dependency property to ViewModel in Xaml

问题描述

我正在将视图模型中的Button的 IsMouseOver 只读依赖属性数据绑定到布尔的读/写属性。 / p>

基本上我需要将Button的 IsMouseOver 属性值读取到视图模型的属性。

 < Button IsMouseOver ={Binding Path = IsMouseOverProperty，Mode = OneWayToSource}/> 
  

我收到一个编译错误：'IsMouseOver'属性是只读的，不能

解决方案

没有错误。这是一个 WPF的限制 - 只读属性无法绑定 OneWayToSource 除非源也是 DependencyProperty 。

另一种替代方法是附加的行为。

I'm trying to databind a Button's IsMouseOver read-only dependency property to a boolean read/write property in my view model.

Basically I need the Button's IsMouseOver property value to be read to a view model's property.

<Button IsMouseOver="{Binding Path=IsMouseOverProperty, Mode=OneWayToSource}" />

I'm getting a compile error: 'IsMouseOver' property is read-only and cannot be set from markup. What am I doing wrong?

解决方案

No mistake. This is a limitation of WPF - a read-only property cannot be bound OneWayToSource unless the source is also a DependencyProperty.

An alternative is an attached behavior.

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